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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2013	Jul. 24, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	SPSC
Entity Registrant Name	SPS COMMERCE INC
Entity Central Index Key	0001092699
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		15,143,247

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 75,134	$ 66,050
Accounts receivable, less allowance for doubtful accounts of $239 and $227, respectively	11,707	10,940
Deferred costs, current	8,288	7,346
Deferred income taxes, current	1,732	1,732
Prepaid expenses and other current assets	2,966	5,443
Total current assets	99,827	91,511
PROPERTY AND EQUIPMENT, net	9,319	7,670
GOODWILL	25,487	25,487
INTANGIBLE ASSETS, net	18,806	20,240
OTHER ASSETS
Deferred costs, net of current portion	3,525	3,202
Deferred income taxes, net of current portion	10,822	10,853
Other non-current assets	202	238
Total assets	167,988	159,201
CURRENT LIABILITIES
Accounts payable	1,650	1,857
Accrued compensation and benefits	6,511	6,038
Accrued expenses and other current liabilities	3,420	1,077
Deferred revenue, current	6,174	5,499
Total current liabilities	17,755	14,471
OTHER LIABILITIES
Deferred revenue, less current portion	8,686	8,312
Deferred rent	2,019	1,601
Total liabilities	28,460	24,384
COMMITMENTS and CONTINGENCIES
STOCKHOLDERS' EQUITY
Preferred stock, $0.001 par value; 5,000,000 shares authorized; 0 shares issued and outstanding
Common stock, $0.001 par value; 55,000,000 shares authorized; 15,141,076 and 14,812,759 shares issued and outstanding, respectively	15	15
Additional paid-in capital	186,869	182,645
Accumulated deficit	(47,356)	(47,843)
Total stockholders' equity	139,528	134,817
Total liabilities and stockholder's equity	$ 167,988	$ 159,201

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 239	$ 227
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	55,000,000	55,000,000
Common stock, shares issued	15,141,076	14,812,759
Common stock, shares outstanding	15,141,076	14,812,759

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenues	$ 25,658	$ 17,821	$ 49,410	$ 34,355
Cost of revenues	7,943	4,843	15,009	9,291
Gross profit	17,715	12,978	34,401	25,064
Operating expenses
Sales and marketing	9,647	6,972	18,872	13,419
Research and development	2,657	1,830	5,160	3,562
General and administrative	4,211	3,165	8,258	6,353
Amortization of intangible assets	717	260	1,434	520
Total operating expenses	17,232	12,227	33,724	23,854
Income from operations	483	751	677	1,210
Other income (expense)
Interest income	22	13	45	28
Other expense	(48)	(38)	(132)	(103)
Total other expense, net	(26)	(25)	(87)	(75)
Income before income taxes	457	726	590	1,135
Income tax expense	(169)	(300)	(103)	(453)
Net income	$ 288	$ 426	$ 487	$ 682
Net income per share
Basic	$ 0.02	$ 0.03	$ 0.03	$ 0.06
Diluted	$ 0.02	$ 0.03	$ 0.03	$ 0.05
Weighted average common shares used to compute net income per share
Basic	15,076	12,284	14,983	12,224
Diluted	15,785	13,026	15,677	13,106

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities
Net income	$ 487	$ 682
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	31	364
Depreciation and amortization of property and equipment	2,353	1,244
Amortization of intangible assets	1,434	520
Provision for doubtful accounts	185	164
Stock-based compensation	2,035	1,327
Changes in assets and liabilities
Accounts receivable	(951)	(1,235)
Deferred costs	(1,265)	(1,136)
Prepaid expenses and other current assets	2,512	157
Accounts payable	(207)	533
Accrued compensation and benefits	473	(312)
Accrued expenses and other current liabilities	497	463
Deferred revenue	1,049	1,800
Net cash provided by operating activities	8,633	4,571
Cash flows from investing activities
Purchases of property and equipment	(1,737)	(1,890)
Net cash used in investing activities	(1,737)	(1,890)
Cash flows from financing activities
Net proceeds from exercise of options to purchase common stock	1,597	811
Excess tax benefit from exercise of options to purchase common stock	40	24
Net proceeds from employee stock purchase plan	551
Net cash provided by financing activities	2,188	835
Net increase in cash and cash equivalents	9,084	3,516
Cash and cash equivalents at beginning of period	66,050	31,985
Cash and cash equivalents at end of period	$ 75,134	$ 35,501

General	6 Months Ended
General	Jun. 30, 2013
Accounting Policies [Abstract]
General	NOTE A – General Business Description We are a leading provider of on-demand supply chain management solutions, providing prewired, proven integrations and comprehensive retail performance analytics to thousands of customers worldwide. We provide our solutions through the SPS Commerce platform, a cloud-based software suite that improves the way suppliers, retailers, distributors and other customers manage and fulfill orders. We deliver our solutions to our customers over the Internet using a Software-as-a-Service model and derive the majority of our revenues from thousands of monthly recurring subscriptions from businesses that utilize our solutions. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, these condensed consolidated financial statements do not include all of the information and notes required by GAAP. We have included all normal recurring adjustments considered necessary to give a fair statement of our financial position, results of operations and cash flows for the interim periods shown. Operating results for these interim periods are not necessarily indicative of the results to be expected for the full year. The December 31, 2012 balance sheet data was derived from our audited financial statements at that date. For further information, refer to the consolidated financial statements and accompanying notes for the year ended December 31, 2012 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on March 6, 2013. Use of Estimates Preparing financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Significant Accounting Policies During the six months ended June 30, 2013, there were no material changes in our significant accounting policies. See Note A to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2012, as filed with the Securities and Exchange Commission on March 6, 2013, for additional information regarding our significant accounting policies. Recent Accounting Pronouncements We have evaluated all recent accounting pronouncements and believe that none of them will have a material effect on our consolidated financial statements.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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+ Details

Intangible Assets, net

6 Months Ended

Jun. 30, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets, net

NOTE B – Intangible Assets, net

Intangible assets included the following (in thousands):


	June 30, 2013							December 31, 2012
	Carrying Amount		Accumulated Amortization			Net		Carrying Amount		Accumulated Amortization			Net
Subscriber relationships	$	23,160	$	(5,113	)	$	18,047	$	23,160	$	(3,850	)	$	19,310
Non-competition agreements		1,710		(951	)		759		1,710		(780	)		930

	$	24,870	$	(6,064	)	$	18,806	$	24,870	$	(4,630	)	$	20,240

Amortization expense for intangible assets was $717,000 and $1.4 million for the three and six months ended June 30, 2013, and $260,000 and $520,000 for the three and six months ended June 30, 2012, respectively.

At June 30, 2013, future amortization expense for intangible assets was as follows (in thousands):


Remainder of 2013	$	1,434
2014		2,688
2015		2,578
2016		2,577
2017		2,557
Thereafter		6,682

	$	18,516

The table above does not include amounts related to non-competition agreements where the term of the agreement has not yet started. The term of such agreements, and the related amortization, begins with the termination of employment of the respective employee(s).

Line of Credit	6 Months Ended
Line of Credit	Jun. 30, 2013
Debt Disclosure [Abstract]
Line of Credit	NOTE C – Line of Credit We have a revolving credit agreement with JPMorgan Chase Bank, N.A. which provides for a $20 million revolving credit facility that we may draw upon from time to time, subject to certain terms and conditions, and will mature on September 30, 2016. There were no borrowings outstanding at June 30, 2013 and we were in compliance with all covenants under the revolving credit agreement as of that date.

Accrued Expenses and Other Current Liabilities	6 Months Ended
Accrued Expenses and Other Current Liabilities	Jun. 30, 2013
Payables And Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	NOTE D – Accrued Expenses and Other Current Liabilities In the second quarter of 2013, we entered into an agreement to purchase software licenses. At June 30, 2013, our future payments under this agreement, which are included in accrued expenses and other current liabilities in our consolidated balance sheets, were approximately $900,000 for the remainder of 2013 and approximately $1.4 million for 2014.

Stock-Based Compensation

6 Months Ended

Jun. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

NOTE E – Stock-Based Compensation

Our equity compensation plans provide for the grant of incentive and nonqualified stock options, as well as other stock-based awards including restricted stock, to employees, non-employee directors and other consultants who provide services to us. Restricted stock awards result in the issuance of new shares when granted. For other stock-based awards, new shares are issued when the award is exercised or vested. In January 2013, 888,765 additional shares were reserved for future issuance under our 2010 Equity Incentive Plan. At June 30, 2013, there were approximately 1.8 million shares available for grant under approved equity compensation plans.

We recorded non-cash stock-based compensation expense of $1.1 million and $2.0 million for the three and six months ended June 30, 2013, and $715,000 and $1.3 million for the three and six months ended June 30, 2012, respectively. This expense was allocated as follows (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Cost of revenues	$	122	$	116	$	225	$	214
Operating expenses
Sales and marketing		386		217		728		395
Research and development		63		29		124		51
General and administrative		540		353		958		667

Total stock-based compensation expense	$	1,111	$	715	$	2,035	$	1,327

As of June 30, 2013, there was approximately $9.3 million of unrecognized stock-based compensation expense under our equity compensation plans, which is expected to be recognized on a straight line basis over a weighted average period of 2.9 years.

Stock Options

Stock options generally vest over four years and have a contractual term of seven to ten years from the date of grant. Our stock option activity was as follows:


	Options (#)			Weighted Average Exercise Price ($/share)
Outstanding at December 31, 2012		1,370,141		$	12.41
Granted		217,457			39.74
Exercised		(285,496	)		5.60
Forfeited		(10,120	)		25.26

Outstanding at June 30, 2013		1,291,982			18.41

Of the total outstanding options at June 30, 2013, 702,687 were exercisable with a weighted average exercise price of $11.37 per share. The total outstanding options had a weighted average remaining contractual life of 6.3 years.

The weighted average fair value per share of options granted during the first six months of 2013 was $14.26 and this was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:


Weighted-average volatility	41.1	%
Expected dividend yield	0	%
Expected life (in years)	4.75
Weighted-average risk-free interest rate	0.84	%

Restricted Stock Units and Awards

Restricted stock units vest over four years and, upon vesting, the holder is entitled to receive shares of our common stock. With restricted stock awards, shares of our common stock are issued when the award is granted and the restrictions lapse over one year.

Our restricted stock units activity was as follows:


	(#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at December 31, 2012		68,241		$	26.35
Granted		57,362			39.03
Vested and common stock issued		(14,472	)		25.44
Forfeited		(1,783	)		31.86

Outstanding at June 30, 2013		109,348			33.28

The number of restricted stock units outstanding at June 30, 2013 included 3,482 units that have vested but shares of common stock have not yet been issued pursuant to the terms of the agreement.

Our restricted stock awards activity was as follows:


	(#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at December 31, 2012		5,275		$	27.55
Restricted common stock issued		5,688			48.66
Restrictions lapsed		(6,697	)		32.03
Forfeited		—			—

Outstanding at June 30, 2013		4,266			48.66

Employee Stock Purchase Plan

Our employee stock purchase plan allows participating employees to purchase shares of our common stock at a discount through payroll deductions. The plan is available to all employees subject to certain eligibility requirements. Participating employees may purchase common stock, on a voluntary after tax basis, at a price that is the lower of 85% of the fair market value of one share of common stock at the beginning or end of each stock purchase period. The plan consists of two six-month offering periods, beginning on January 1 and July 1 of each calendar year. A total of 1.2 million shares of common stock are reserved for issuance under the plan.

For the offering period that began on January 1, 2013 and ended June 30, 2013, we withheld approximately $551,000 from employees participating in the plan. On June 30, 2013, 17,386 shares were purchased on behalf of the employees participating in the plan and approximately 1.2 million shares were available for future purchases.

For the three and six months ended June 30, 2013, we recorded approximately $90,000 and $183,000 of stock-based compensation expense associated with the employee stock purchase plan. The fair value was estimated based on the market price of our common stock at the beginning of the offering period, which was $37.27 per share, and using the Black-Scholes option pricing model with the following assumptions:


Expected volatility	41.1	%
Expected dividend yield	0	%
Expected life (in years)	0.50
Risk-free interest rate	0.12	%

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	NOTE F – Income Taxes We recorded income tax expense of $169,000 and $103,000 for the three and six months ended June 30, 2013. We recorded income tax expense of $300,000 and $453,000 for the three and six months ended June 30, 2012. We record our interim provision for income taxes based on our estimated annual effective tax rate for the year. Differences between our effective tax rate and statutory tax rates are primarily due to the impact of meals, entertainment and employee stock purchase plan expenses, as well as the federal R&D credit. Our provisions for income taxes included current foreign and state income tax expense, as well as deferred tax expense. The decrease in income tax expense for the six months ended June 30, 2013, compared to the six months ended June 30, 2012, was primarily due to a discrete tax benefit of $117,000 in 2013 for the retroactive benefit of the 2012 federal R&D credit. The American Taxpayer Relief Act of 2012 was enacted on January 2, 2013 and extended the federal R&D credit from January 1, 2012 through December 31, 2013. We are subject to income taxes in the U.S. federal and various state and international jurisdictions. As of June 30, 2013, we are generally subject to tax examinations for all prior years due to our net operating loss carryforwards. As of June 30, 2013, we do not have any unrecognized tax benefits. It is our practice to recognize interest and penalties accrued on any unrecognized tax benefits as a component of income tax expense. We do not expect any material changes in our unrecognized tax positions over the next 12 months.

Net Income Per Share

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Net Income Per Share

NOTE G – Net Income Per Share

Basic net income per share has been computed using the weighted average number of shares of common stock outstanding during each period. Diluted net income per share also includes the impact of our outstanding potential common shares, including options and restricted stock units. Potential common shares that are anti-dilutive are excluded from the calculation of diluted net income per share.

The following table presents the components of the computation of basic and diluted net income per share for the periods indicated (in thousands, except per share amounts):


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
Numerator
Net income	$	288	$	426	$	487	$	682

Denominator
Weighted average common shares outstanding, basic		15,076		12,284		14,983		12,224
Options to purchase common stock		665		728		646		858
Restricted stock units		39		14		45		24
Employee stock purchase plan		5		—		3		—

Weighted average common shares outstanding, diluted		15,785		13,026		15,677		13,106

Net income per share
Basic	$	0.02	$	0.03	$	0.03	$	0.06

Diluted	$	0.02	$	0.03	$	0.03	$	0.05

For each of the three and six months ended June 30, 2013, the effect of approximately 16,000 outstanding potential common shares were excluded from the calculation of diluted net income per share because they were anti-dilutive. For each of the three and six months ended June 30, 2012, the effect of approximately 22,000 outstanding potential common shares were excluded from the calculation of diluted net income per share because they were anti-dilutive.

General (Policies)	6 Months Ended
General (Policies)	Jun. 30, 2013
Accounting Policies [Abstract]
Business Description	Business Description We are a leading provider of on-demand supply chain management solutions, providing prewired, proven integrations and comprehensive retail performance analytics to thousands of customers worldwide. We provide our solutions through the SPS Commerce platform, a cloud-based software suite that improves the way suppliers, retailers, distributors and other customers manage and fulfill orders. We deliver our solutions to our customers over the Internet using a Software-as-a-Service model and derive the majority of our revenues from thousands of monthly recurring subscriptions from businesses that utilize our solutions.
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, these condensed consolidated financial statements do not include all of the information and notes required by GAAP. We have included all normal recurring adjustments considered necessary to give a fair statement of our financial position, results of operations and cash flows for the interim periods shown. Operating results for these interim periods are not necessarily indicative of the results to be expected for the full year. The December 31, 2012 balance sheet data was derived from our audited financial statements at that date. For further information, refer to the consolidated financial statements and accompanying notes for the year ended December 31, 2012 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on March 6, 2013.
Use of Estimates	Use of Estimates Preparing financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.
Significant Accounting Policies	Significant Accounting Policies During the six months ended June 30, 2013, there were no material changes in our significant accounting policies. See Note A to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2012, as filed with the Securities and Exchange Commission on March 6, 2013, for additional information regarding our significant accounting policies.
Recent Accounting Pronouncements	Recent Accounting Pronouncements We have evaluated all recent accounting pronouncements and believe that none of them will have a material effect on our consolidated financial statements.

Intangible Assets, net (Tables)

6 Months Ended

Jun. 30, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets included the following (in thousands):


	June 30, 2013							December 31, 2012
	Carrying Amount		Accumulated Amortization			Net		Carrying Amount		Accumulated Amortization			Net
Subscriber relationships	$	23,160	$	(5,113	)	$	18,047	$	23,160	$	(3,850	)	$	19,310
Non-competition agreements		1,710		(951	)		759		1,710		(780	)		930

	$	24,870	$	(6,064	)	$	18,806	$	24,870	$	(4,630	)	$	20,240

Future Amortization Expense for Intangible Assets

At June 30, 2013, future amortization expense for intangible assets was as follows (in thousands):


Remainder of 2013	$	1,434
2014		2,688
2015		2,578
2016		2,577
2017		2,557
Thereafter		6,682

	$	18,516

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Stock-Based Compensation Expense

This expense was allocated as follows (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Cost of revenues	$	122	$	116	$	225	$	214
Operating expenses
Sales and marketing		386		217		728		395
Research and development		63		29		124		51
General and administrative		540		353		958		667

Total stock-based compensation expense	$	1,111	$	715	$	2,035	$	1,327

Stock Option Activity

Our stock option activity was as follows:


	Options (#)			Weighted Average Exercise Price ($/share)
Outstanding at December 31, 2012		1,370,141		$	12.41
Granted		217,457			39.74
Exercised		(285,496	)		5.60
Forfeited		(10,120	)		25.26

Outstanding at June 30, 2013		1,291,982			18.41

Weighted Average Fair Value Per Share of Options Granted, Assumptions


Weighted-average volatility	41.1	%
Expected dividend yield	0	%
Expected life (in years)	4.75
Weighted-average risk-free interest rate	0.84	%

Weighted Average Fair Value Per Share, Employee Stock Purchase Plan, Assumptions

The fair value was estimated based on the market price of our common stock at the beginning of the offering period, which was $37.27 per share, and using the Black-Scholes option pricing model with the following assumptions:


Expected volatility	41.1	%
Expected dividend yield	0	%
Expected life (in years)	0.50
Risk-free interest rate	0.12	%

Restricted Stock Units [Member]

Restricted Stock Units and Restricted Stock Awards

Our restricted stock units activity was as follows:


	(#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at December 31, 2012		68,241		$	26.35
Granted		57,362			39.03
Vested and common stock issued		(14,472	)		25.44
Forfeited		(1,783	)		31.86

Outstanding at June 30, 2013		109,348			33.28

Restricted Stock Award [Member]

Restricted Stock Units and Restricted Stock Awards

Our restricted stock awards activity was as follows:


	(#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at December 31, 2012		5,275		$	27.55
Restricted common stock issued		5,688			48.66
Restrictions lapsed		(6,697	)		32.03
Forfeited		—			—

Outstanding at June 30, 2013		4,266			48.66

Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Components of Computation of Basic and Diluted Net Income Per Share

The following table presents the components of the computation of basic and diluted net income per share for the periods indicated (in thousands, except per share amounts):


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
Numerator
Net income	$	288	$	426	$	487	$	682

Denominator
Weighted average common shares outstanding, basic		15,076		12,284		14,983		12,224
Options to purchase common stock		665		728		646		858
Restricted stock units		39		14		45		24
Employee stock purchase plan		5		—		3		—

Weighted average common shares outstanding, diluted		15,785		13,026		15,677		13,106

Net income per share
Basic	$	0.02	$	0.03	$	0.03	$	0.06

Diluted	$	0.02	$	0.03	$	0.03	$	0.05

Intangible Assets, Net - Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	$ 24,870	$ 24,870
Accumulated Amortization	(6,064)	(4,630)
Net	18,806	20,240
Subscriber relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	23,160	23,160
Accumulated Amortization	(5,113)	(3,850)
Net	18,047	19,310
Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	1,710	1,710
Accumulated Amortization	(951)	(780)
Net	$ 759	$ 930

Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 717	$ 260	$ 1,434	$ 520

Intangible Assets, Net - Future Amortization Expense for Intangible Assets (Detail) $ in Thousands	Jun. 30, 2013 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2013	$ 1,434
2014	2,688
2015	2,578
2016	2,577
2017	2,557
Thereafter	6,682
Future amortization expense for intangible assets	$ 18,516

Line of Credit - Additional Information (Detail)	6 Months Ended
Line of Credit - Additional Information (Detail)	Jun. 30, 2013 USD ($)
Debt Disclosure [Abstract]
Revolving credit facility, amount	$ 20,000,000
Revolving credit facility, maturity date	Sep. 30, 2016
Borrowings outstanding revolving credit agreement	$ 0

Accrued Expenses and Other Current Liabilities - Additional Information (Detail) - Software And Licenses [Member]	Jun. 30, 2013 USD ($)
Accrued Expenses And Other Current Liabilities [Line Items]
Future payments for reminder of fiscal year	$ 900,000
Future payments for next fiscal year	$ 1,400,000

Stock-Based Compensation - Additional Information (Detail)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2013 shares	Jun. 30, 2013 USD ($) $ / shares shares	Jun. 30, 2012 USD ($)	Jun. 30, 2013 USD ($) OfferingPeriods $ / shares shares	Jun. 30, 2012 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant		1,800,000		1,800,000
Stock-based compensation expense \| $		$ 1,111,000	$ 715,000	$ 2,035,000	$ 1,327,000
Unrecognized stock-based compensation expense \| $		$ 9,300,000		$ 9,300,000
Unrecognized stock-based compensation, expected to be recognized, weighted average period				2 years 10 months 24 days
Stock options vest, period				4 years
Stock options contractual term, from the date of grant				Seven to ten years
Stock options exercisable		702,687		702,687
Weighted average exercise price \| $ / shares		$ 11.37		$ 11.37
Weighted average remaining contractual life				6 years 3 months 18 days
Weighted average fair value per share of options granted \| $ / shares				$ 14.26
Percentage of common stock on fair market value				85.00%
Number of offerings per year \| OfferingPeriods				2
Employee stock purchase plan, market price of common stock \| $ / shares		$ 37.27
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units vest over, period				4 years
Number of RSU's vested and not issued during the period				3,482
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards units vest over, period				1 year
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options contractual term Range				10 years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options contractual term Range				7 years
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 90,000		$ 183,000
Common stock reserved for future issuance		1,200,000		1,200,000
Employee stock purchase plan, employees contribution \| $		$ 551,000		$ 551,000
Common stock available for future purchases		1,200,000		1,200,000
Employee stock purchase plan, shares purchased				17,386
Equity Incentive Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares were authorized under 2010 Equity Incentive Plan	888,765

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,111	$ 715	$ 2,035	$ 1,327
Cost of revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	122	116	225	214
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	386	217	728	395
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	63	29	124	51
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 540	$ 353	$ 958	$ 667

Stock-Based Compensation - Stock Option Activity (Detail)	6 Months Ended
	Jun. 30, 2013 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding at December 31, 2012 \| shares	1,370,141
Options, Granted \| shares	217,457
Options, Exercised \| shares	(285,496)
Options, Forfeited \| shares	(10,120)
Options Outstanding at June 30, 2013 \| shares	1,291,982
Weighted Average Exercise Price, Outstanding at December 31, 2012 \| $ / shares	$ 12.41
Weighted Average Exercise Price, Granted \| $ / shares	39.74
Weighted Average Exercise Price, Exercised \| $ / shares	5.60
Weighted Average Exercise Price, Forfeited \| $ / shares	25.26
Weighted Average Exercise Price, Outstanding at June 30, 2013 \| $ / shares	$ 18.41

Stock-Based Compensation - Weighted Average Fair Value Per Share of Options Granted (Detail) - Stock Options [Member]	6 Months Ended
	Jun. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Weighted-average volatility	41.10%
Expected dividend yield	0.00%
Expected life (in years)	4 years 9 months
Weighted-average risk-free interest rate	0.84%

Stock-Based Compensation - Restricted Stock Units (Detail) - Restricted Stock Units [Member]	6 Months Ended
	Jun. 30, 2013 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding at December 31, 2012 \| shares	68,241
Granted, stock units \| shares	57,362
Vested, stock units \| shares	(14,472)
Forfeited, stock units \| shares	(1,783)
Stock awards, Outstanding at June 30, 2013 \| shares	109,348
Weighted average grant date fair value, Outstanding at December 31, 2012 \| $ / shares	$ 26.35
Granted, Weighted Average Grant Date Fair Value \| $ / shares	39.03
Vested, Weighted Average Grant Date Fair Value \| $ / shares	25.44
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	31.86
Weighted average grant date fair value, Outstanding at June 30, 2013 \| $ / shares	$ 33.28

Stock-Based Compensation - Restricted Stock Awards (Detail) - Restricted Stock Award [Member]	6 Months Ended
	Jun. 30, 2013 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding at December 31, 2012 \| shares	5,275
Restricted common stock issued, stock awards \| shares	5,688
Restrictions lapsed, stock awards \| shares	(6,697)
Forfeited, stock awards \| shares
Stock awards, Outstanding at June 30, 2013 \| shares	4,266
Weighted average grant date fair value, Outstanding at December 31, 2012 \| $ / shares	$ 27.55
Restricted common stock issued, Weighted Average Grant Date Fair Value \| $ / shares	48.66
Restrictions lapsed, Weighted Average Grant Date Fair Value \| $ / shares	32.03
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares
Weighted average grant date fair value, Outstanding at June 30, 2013 \| $ / shares	$ 48.66

Stock-Based Compensation - Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Assumptions (Detail) - Employee Stock Purchase Plan [Member]	6 Months Ended
	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	41.10%
Expected dividend yield	0.00%
Expected life (in years)	6 months
Risk-free interest rate	0.12%

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ 169,000	$ 300,000	$ 103,000	$ 453,000
State deferred tax	117,000		117,000
Unrecognized tax benefits	0		0
Material changes in our unrecognized tax positions over the next 12 months	$ 0		$ 0

Net Income Per Share - Components of Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator
Net income	$ 288	$ 426	$ 487	$ 682
Denominator
Weighted average common shares outstanding, basic	15,076	12,284	14,983	12,224
Options to purchase common stock	665	728	646	858
Restricted stock units	39	14	45	24
Employee stock purchase plan	5		3
Weighted average common shares outstanding, diluted	15,785	13,026	15,677	13,106
Net income per share
Basic	$ 0.02	$ 0.03	$ 0.03	$ 0.06
Diluted	$ 0.02	$ 0.03	$ 0.03	$ 0.05

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Outstanding potential common shares, anti-dilutive	16,000	22,000	16,000	22,000